;   Copyright (c) Rich Hickey. All rights reserved.

 ;   The use and distribution terms for this software are covered by the

 ;   Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)

 ;   which can be found in the file epl-v10.html at the root of this distribution.

 ;   By using this software in any fashion, you are agreeing to be bound by

 ;   the terms of this license.

 ;   You must not remove this notice, or any other, from this software.

 

 ;;  Tests for the Clojure 'for' macro

 ;;

 ;;  by Chouser

 ;;  Created Dec 2008

 

 (ns clojure.test-clojure.for

   (:use clojure.test))

 

 (deftest Docstring-Example

   (is (= (take 100 (for [x (range 100000000)

                          y (range 1000000) :while (< y x)]

                      [x y]))

          '([1 0] [2 0] [2 1] [3 0] [3 1] [3 2] [4 0] [4 1] [4 2] [4 3]

            [5 0] [5 1] [5 2] [5 3] [5 4]

            [6 0] [6 1] [6 2] [6 3] [6 4] [6 5]

            [7 0] [7 1] [7 2] [7 3] [7 4] [7 5] [7 6]

            [8 0] [8 1] [8 2] [8 3] [8 4] [8 5] [8 6] [8 7]

            [9 0] [9 1] [9 2] [9 3] [9 4] [9 5] [9 6] [9 7] [9 8]

            [10 0] [10 1] [10 2] [10 3] [10 4] [10 5] [10 6] [10 7] [10 8] [10 9]

            [11 0] [11 1] [11 2] [11 3] [11 4] [11 5] [11 6] [11 7] [11 8] [11 9]

              [11 10]

            [12 0] [12 1] [12 2] [12 3] [12 4] [12 5] [12 6] [12 7] [12 8] [12 9]

              [12 10] [12 11]

            [13 0] [13 1] [13 2] [13 3] [13 4] [13 5] [13 6] [13 7] [13 8] [13 9]

              [13 10] [13 11] [13 12]

            [14 0] [14 1] [14 2] [14 3] [14 4] [14 5] [14 6] [14 7] [14 8]))))

 

 (defmacro deftest-both [txt & ises]

   `(do

      (deftest ~(symbol (str "For-" txt)) ~@ises)

      (deftest ~(symbol (str "Doseq-" txt))

               ~@(map (fn [[x-is [x-= [x-for binds body] value]]]

                        (when (and (= x-is 'is) (= x-= '=) (= x-for 'for))

                          `(is (= (let [acc# (atom [])]

                                    (doseq ~binds (swap! acc# conj ~body))

                                    @acc#)

                                  ~value))))

                      ises))))

 

 (deftest-both When

   (is (= (for [x (range 10) :when (odd? x)] x) '(1 3 5 7 9)))

   (is (= (for [x (range 4) y (range 4) :when (odd? y)] [x y])

          '([0 1] [0 3] [1 1] [1 3] [2 1] [2 3] [3 1] [3 3])))

   (is (= (for [x (range 4) y (range 4) :when (odd? x)] [x y])

          '([1 0] [1 1] [1 2] [1 3] [3 0] [3 1] [3 2] [3 3])))

   (is (= (for [x (range 4) :when (odd? x) y (range 4)] [x y])

          '([1 0] [1 1] [1 2] [1 3] [3 0] [3 1] [3 2] [3 3])))

   (is (= (for [x (range 5) y (range 5) :when (< x y)] [x y])

          '([0 1] [0 2] [0 3] [0 4] [1 2] [1 3] [1 4] [2 3] [2 4] [3 4]))))

 

 (defn only

   "Returns a lazy seq of increasing ints starting at 0.  Trying to get

   the nth+1 value of the seq throws an exception.  This is meant to

   help detecting over-eagerness in lazy seq consumers."

   [n]

   (lazy-cat (range n)

             (throw (Exception. "consumer went too far in lazy seq"))))

 

 (deftest-both While

   (is (= (for [x (only 6) :while (< x 5)] x) '(0 1 2 3 4)))

   (is (= (for [x (range 4) y (only 4) :while (< y 3)] [x y])

          '([0 0] [0 1] [0 2] [1 0] [1 1] [1 2]

            [2 0] [2 1] [2 2] [3 0] [3 1] [3 2])))

   (is (= (for [x (range 4) y (range 4) :while (< x 3)] [x y])

          '([0 0] [0 1] [0 2] [0 3] [1 0] [1 1] [1 2] [1 3]

            [2 0] [2 1] [2 2] [2 3])))

   (is (= (for [x (only 4) :while (< x 3) y (range 4)] [x y])

          '([0 0] [0 1] [0 2] [0 3] [1 0] [1 1] [1 2] [1 3]

            [2 0] [2 1] [2 2] [2 3])))

   (is (= (for [x (range 4) y (range 4) :while (even? x)] [x y])

          '([0 0] [0 1] [0 2] [0 3] [2 0] [2 1] [2 2] [2 3])))

   (is (= (for [x (only 2) :while (even? x) y (range 4)] [x y])

          '([0 0] [0 1] [0 2] [0 3])))

   (is (= (for [x (range 4) y (only 4) :while (< y x)] [x y])

          '([1 0] [2 0] [2 1] [3 0] [3 1] [3 2]))))

 

 (deftest-both While-and-When

   (is (= (for [x (only 6) :while (< x 5) y (range 4) :when (odd? y)] [x y])

          '([0 1] [0 3] [1 1] [1 3] [2 1] [2 3] [3 1] [3 3] [4 1] [4 3])))

   (is (= (for [x (range 4) :when (odd? x) y (only 6) :while (< y 5)] [x y])

          '([1 0] [1 1] [1 2] [1 3] [1 4] [3 0] [3 1] [3 2] [3 3] [3 4])))

   (is (= (for [x (only 6) :while (< x 5) y (range 4) :when (odd? (+ x y))]

            [x y])

          '([0 1] [0 3] [1 0] [1 2] [2 1] [2 3] [3 0] [3 2] [4 1] [4 3])))

   (is (= (for [x (range 4) :when (odd? x) y (only 2) :while (odd? (+ x y))]

            [x y])

          '([1 0] [3 0]))))

 

 (deftest-both While-and-When-Same-Binding

   (is (= (for [x (only 6) :while (< x 5) :when (odd? x)] x) '(1 3)))

   (is (= (for [x (only 6)

                :while (< x 5) ; if :while is false, :when should not be evaled

                :when (do (if (< x 5) (odd? x)))] x) '(1 3)))

   (is (= (for [a (range -2 5)

                :when (not= a 0) ; :when may guard :while

                :while (> (Math/abs (/ 1.0 a)) 1/3)] a) '(-2 -1 1 2))))

 

 (deftest-both Nesting

   (is (= (for [x '(a b) y (interpose x '(1 2)) z (list x y)] [x y z])

          '([a 1 a] [a 1 1] [a a a] [a a a] [a 2 a] [a 2 2]

            [b 1 b] [b 1 1] [b b b] [b b b] [b 2 b] [b 2 2])))

   (is (= (for [x ['a nil] y [x 'b]] [x y])

          '([a a] [a b] [nil nil] [nil b]))))

 

 (deftest-both Destructuring

   (is (= (for [{:syms [a b c]} (map #(zipmap '(a b c) (range % 5)) (range 3))

                x [a b c]]

            (Integer. (str a b c x)))

          '(120 121 122 1231 1232 1233 2342 2343 2344))))

 

 (deftest-both Let

   (is (= (for [x (range 3) y (range 3) :let [z (+ x y)] :when (odd? z)] [x y z])

          '([0 1 1] [1 0 1] [1 2 3] [2 1 3])))

   (is (= (for [x (range 6) :let [y (rem x 2)] :when (even? y) z [8 9]] [x z])

          '([0 8] [0 9] [2 8] [2 9] [4 8] [4 9]))))

 

 ; :while must skip all subsequent chunks as well as the remainder of

 ; the current chunk:

 (deftest-both Chunked-While

   (is (= (for [x (range 100) :while (even? x)] x) '(0))))